I2C fast to slow at runtime
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  1. - 9th February 2018, 18:31 #1
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    kenif
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    Default I2C fast to slow at runtime

    This project requires a 100k device and a 400k device on the same bus.
    The I2C slow command appears to be compile only.
    Is there a way to change fast to slow and back again at runtime?
    Thanks.
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  2. - 9th February 2018, 18:33 #2
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    Default Re: I2C fast to slow at runtime

    No. But as far as I know all 400K devices work on 100K.
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  3. - 9th February 2018, 20:24 #3
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    Default Re: I2C fast to slow at runtime

    Quote Originally Posted by pedja089 View Post
    No. But as far as I know all 400K devices work on 100K.
    Yes, it works fine. At the moment we have a 900 us read (Honeywell pressure sensor), but at 400k it's about 225 us, and saving the extra time would be useful.
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  4. - 9th February 2018, 21:22 #4
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    Default Re: I2C fast to slow at runtime

    If you need the speed, then what devices are running at 100K?
    Dave Purola,
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  5. - 9th February 2018, 23:43 #5
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    Default Re: I2C fast to slow at runtime

    or use the mssp module if your chip has one
    http://support.melabs.com/forum/picb...c-hardware-i2c
    This is more entertaining than Free to Air TV
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  6. - 11th February 2018, 23:59 #6
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    Default Re: I2C fast to slow at runtime

    Quote Originally Posted by Dave View Post
    If you need the speed, then what devices are running at 100K?
    Microchip TC74.
    We used this for the TO-220 packaging - it is screwed to a motor where it is difficult to put a PCB.
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  7. - 12th February 2018, 00:03 #7
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    Default Re: I2C fast to slow at runtime

    Quote Originally Posted by richard View Post
    or use the mssp module if your chip has one
    http://support.melabs.com/forum/picb...c-hardware-i2c
    Thanks, I'll look into that.
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